FISH FINDER

To provide a fish finder that can shorten a distance of the dead zone while improving detection performance.SOLUTION: A fish finder includes: first control means 21a that transmits an ultrasonic beam TB from a vibrator 16 at a fixed first frequency f0 for a first time T1 and controls the reflected w...

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Bibliographische Detailangaben
1. Verfasser:	HIGUCHI KAZUKI
Format:	Patent
Sprache:	eng ; jpn
Schlagworte:	ANALOGOUS ARRANGEMENTS USING OTHER WAVES DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION ORRERADIATION OF RADIO WAVES MEASURING PHYSICS RADIO DIRECTION-FINDING RADIO NAVIGATION TESTING
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Beschreibung
Zusammenfassung:	To provide a fish finder that can shorten a distance of the dead zone while improving detection performance.SOLUTION: A fish finder includes: first control means 21a that transmits an ultrasonic beam TB from a vibrator 16 at a fixed first frequency f0 for a first time T1 and controls the reflected wave to be received by the vibrator 16; and second control means 21b that, after the control by the first control means 21a, transmits the ultrasonic beam TB from the vibrator 16 while changing the frequency between a second frequency f2 and a third frequency f3 over a second time T2 longer than the first time T1 and controls the reflected wave to be received by the vibrator 16.SELECTED DRAWING: Figure 3 【課題】探知性能を上げつつ不感帯の距離を短くできる魚群探知装置を提供すること。【解決手段】固定された第１周波数ｆ０にて超音波ビームＴＢを振動子１６より第１時間Ｔ１送信し、その反射波を振動子１６にて受信するように制御する第１制御手段２１ａと、第１制御手段２１ａによる制御後に、第１時間Ｔ１よりも長い第２時間Ｔ２かけて第２周波数ｆ２から第３周波数ｆ３の間で周波数を変化させながら超音波ビームＴＢを振動子１６より送信し、その反射波を振動子１６にて受信するように制御する第２制御手段２１ｂと、を備える。【選択図】図３